What absorbs at 833 cm⁻¹ in an FTIR spectrum?
A band near 833 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
A band near 833 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkyl C-H | 8 | 7 | 1.0 |
| Aromatic ring | 6 | 5 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Sulfate (SO4) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 0.9 |
| Metal oxygen | 1 | 0 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| PVA | 833, 1660, 2930 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 2 |
| Nanotubes | 833, 1735, 1630 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
| ZnO | 833, 1400, 3430 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
| graphene oxide | 833, 1150, 3400 | Methacrylate, Alkyl C-H, Methoxy (OCH3) | 1 |
| glycerol | 833, 1585, 1630 | Methacrylate, Alkyl C-H, Methoxy (OCH3) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 833 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literature behind these assignments
-
Sulfate (SO4) confidence 1.0
“All species 833cm-1 corresponds to sulfate that is substituted and fucoidan standard showed wavelength at C-6.”
Artemisia 等 - 2019 - The Properties of Brown Marine Algae Sargassum tur DOI: 10.14499/indonesianjpharm30iss1pp43 -
Alkyl C-H confidence 1.0
“The intensity of the two peaks cm-1 C-H rocking in PVA is the cause for the band at 833 (see Figure 2a,) [18].”
Characteristics of a Plasticized PVA-Based Polymer Electrolyte Membrane and H+ Conductor for an Electrical Double-Layer Capacitor: Structural, Morphological, and Ion Transport Properties DOI: 10.3390/membranes -
N h confidence 1.0
“The amine group accepts an electron in FF-MNS shifts to 815 plane NH bending) mode at 833 cm-1 Fe2+ Co2+ from ions (most likely at the O site) or ions, in FF-MNS:CFO.”
Functionalized Self-Assembled Peptide Nanotubes with Cobalt Ferrite Nanoparticles for Applications in Organic Electronics DOI: 10.1021/acsanm.7b00344 -
Acetate confidence 1.0
“band at 833 cm-1 is associated with stretching C-O-C of the oxirane group [66].”
Pereira 等 - 2020 - Ballistic Performance of Ramie Fabric Reinforcing DOI: 10.3390/polym12112711 -
Alkyl C-H confidence 1.0
“The peak at 833 is associated with the -CH ] 2 R Q α where is the gas constant, is the released heat, is the”
Optical, electrical, mechanical, and thermal properties and non-isothermal decomposition behavior of poly(vinyl alcohol)–ZnO nanocomposites DOI: 10.1007/s13726-020-00806-8 -
Acetate confidence 1.0
“The carbonate bending modes and ) are practically unaffected by CEPTE C-O ,833 cm-1 C-O ,630 cm-1 (ν Zn2+: Al3+ 300 the ratio, but the stretching mode cm-1) exhibits direct correlation.”
Dependence of bonding interactions in Layered Double Hydroxides on metal cation chemistry DOI: 10.1016/j.molstruc.2016.06.045 -
C c single bond confidence 1.0
“Glucosamine 327 (18.6) 528 (13.8) 845 bending/SO3(cid:0) stretching Fucose TR TR C-C C-H 833 831 stretching,”
Organic biopolymers of venus clams: Collagen-related matrix in the bivalve shells with crossed-lamellar ultrastructure DOI: 10.1016/j.bbrep.2021.100939 -
Alkyl C-H confidence 1.0
“The bending vibrations of plane verified at positions 684, 833 cm-1 C-H The bending vibrations of plane verified at positions 684, 833 and 957 [27,28].”
New Hybrid PVC/PVP Polymer Blend Modified with Er2O3 Nanoparticles for Optoelectronic Applications DOI: 10.3390/polym15030684
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